How did ancient civilizations move massive stones to build Stonehenge, the Pyramids and the Easter Island statues? In this quick, delightful talk, TED Fellow Brandon Clifford reveals some architectural secrets of the past and shows how we can use these ingenious techniques to build today. "In an era where we design buildings to last 30, maybe 60 years, I would love to learn how to create something that could entertain for an eternity," he says.

Lindsay Amer is the creator of "Queer Kid Stuff," an educational video series that breaks down complex ideas around gender and sexuality through songs and metaphors. By giving kids and their families a vocabulary to express themselves, Amer is helping to create more empathetic adults -- and spreading a message of radical acceptance in a world where it's sometimes dangerous to just be yourself. "I want kids to grow up and into themselves with pride for who they are and who they can be," Amer says.

Starting in 80 CE, residents of Rome and visitors from across the Roman Empire would fill the stands of the Colosseum to see gladiators duel, animals fight and chariots race around the arena. And for the grand finale, water poured into the arena basin, submerging the stage for the greatest spectacle of all: staged naval battles. Janelle Peters details the history of these mock maritime encounters. [Directed by Brett Underhill, narrated by Bethany Cutmore-Scott].

Ethan Lindenberger never got vaccinated as a kid. So one day, he went on Reddit and asked a simple question: "Where do I go to get vaccinated?" The post went viral, landing Lindenberger in the middle of a heated debate about vaccination and, ultimately, in front of a US Senate committee. Less than a year later, the high school senior reports back on his unexpected time in the spotlight and a new movement he's leading to fight misinformation and advocate for scientific truth.

Alixa Garcia and Naima Penniman of Climbing PoeTree combine impactful poetry and sharp beatboxing in a spoken word performance of "Being Human." They're joined by the captivating vocals and instrumental melodies of Claudia Cuentas and Tonya Abernathy for "Awakening."

"Who's there?" Whispered in the dark, this question begins a tale of conspiracy, deception and moral ambiguity. And in a play where everyone has something to hide, its answer is far from simple. Written by William Shakespeare, "Hamlet" depicts its titular character haunted by the past, but immobilized by the future. Iseult Gillespie digs into the humanity and tragedy of Hamlet. [Directed by Lucy Animation Studio, narrated by Jack Cutmore-Scott, music by Stephen LaRosa].

Asking for help is tough. But to get through life, you have to do it all the time. So how do you get comfortable asking? In this actionable talk, social psychologist Heidi Grant shares four simple rules for asking for help and getting it -- while making the process more rewarding for your helper, too.

Being open and vulnerable with your loneliness, sadness and fear can help you find comfort and feel less alone, says writer and artist Jonny Sun. In an honest talk filled with his signature illustrations, Sun shares how telling stories about feeling like an outsider helped him tap into an unexpected community and find a tiny sliver of light in the darkness.

In 2008, two 9,000-year old skeletons were found with their bones infected by an all too familiar bacterium. The ancient Greeks knew its effects as phthisis; the Incans called it chaky oncay; and today we call it tuberculosis, or TB. TB is still one of the world's most infectious killers, causing more deaths than malaria or even HIV. How has it persisted for so long? Melvin Sanicas investigates. [Directed by Augenblick Studios, narrated by Addison Anderson, music by GDM Production Music].

"The hood is good," says Jon Gray of the Bronx, New York-based creative collective Ghetto Gastro. Working at the intersection of food, design and art, Gray and his team work to honor the soul and history of their community, while also applying their unbridled creativity and expansive imagination to unexpected, otherworldly collaborations. Learn more about how they're creating and investing in their home borough -- bringing the Bronx to the world and vice versa.